diff --git a/src/main/java/kahlua/KahluaProject/apipayload/code/status/ErrorStatus.java b/src/main/java/kahlua/KahluaProject/apipayload/code/status/ErrorStatus.java
index 7cc6547..83b649d 100644
--- a/src/main/java/kahlua/KahluaProject/apipayload/code/status/ErrorStatus.java
+++ b/src/main/java/kahlua/KahluaProject/apipayload/code/status/ErrorStatus.java
@@ -41,7 +41,7 @@ public enum ErrorStatus implements BaseCode {
     APPLY_INFO_NOT_FOUND(HttpStatus.NOT_FOUND, "APPLY INFO NOT FOUND", "존재하지 않는 지원정보 입니다." ),
 
     // 웹소켓 에러
-    WEBSOCKET_SESSION_UNAUTHORIZED(HttpStatus.UNAUTHORIZED, "WEBSOCKET SESSION UNAUTHORIZED", "웹소켓 연결에 실패했습니다."),
+    WEBSOCKET_SESSION_UNAUTHORIZED(HttpStatus.BAD_REQUEST, "WEBSOCKET ERROR", "웹소켓 연결 과정에서 에러가 발생했습니다."),
 
     // 게시판 에러
     IMAGE_NOT_UPLOAD(HttpStatus.BAD_REQUEST, "IMAGE_NOT_UPLOAD", "이미지 업로드 개수를 초과하였습니다."),
diff --git a/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepository.java b/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepository.java
index bbe91de..08346e3 100644
--- a/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepository.java
+++ b/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepository.java
@@ -4,10 +4,12 @@
 import kahlua.KahluaProject.domain.user.User;
 
 import java.time.LocalDate;
+import java.time.LocalTime;
 import java.util.List;
 
 public interface ReservationCustomRepository {
 
     List<Reservation> findByDate(LocalDate date);
     List<Reservation> findByUser(User user);
+    Boolean existByDateAndTime(LocalDate date, LocalTime startTime, LocalTime endTime);
 }
diff --git a/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepositoryImpl.java b/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepositoryImpl.java
index 98db251..a33581c 100644
--- a/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepositoryImpl.java
+++ b/src/main/java/kahlua/KahluaProject/repository/reservation/ReservationCustomRepositoryImpl.java
@@ -7,6 +7,7 @@
 import org.springframework.stereotype.Repository;
 
 import java.time.LocalDate;
+import java.time.LocalTime;
 import java.util.List;
 
 import static kahlua.KahluaProject.domain.reservation.QReservation.reservation;
@@ -36,4 +37,15 @@ public List<Reservation> findByUser(User user) {
                 .orderBy(reservation.reservationDate.asc(), reservation.startTime.asc())
                 .fetch();
     }
+
+    @Override
+    public Boolean existByDateAndTime(LocalDate date, LocalTime startTime, LocalTime endTime) {
+        return jpaQueryFactory
+                .selectOne()
+                .from(reservation)
+                .where(reservation.reservationDate.eq(date)
+                        .and(reservation.startTime.lt(endTime) // 시작 시간이 새로운 예약 종료 시간보다 작고
+                        .and(reservation.endTime.gt(startTime)))) // 종료 시간이 새로운 예약 시작 시간보다 큰 경우
+                .fetchFirst() != null;
+    }
 }
diff --git a/src/main/java/kahlua/KahluaProject/service/ReservationService.java b/src/main/java/kahlua/KahluaProject/service/ReservationService.java
index 98e980b..bd8b90a 100644
--- a/src/main/java/kahlua/KahluaProject/service/ReservationService.java
+++ b/src/main/java/kahlua/KahluaProject/service/ReservationService.java
@@ -11,6 +11,7 @@
 import kahlua.KahluaProject.dto.reservation.response.ReservationResponse;
 import kahlua.KahluaProject.exception.GeneralException;
 import kahlua.KahluaProject.repository.reservation.ReservationRepository;
+import kahlua.KahluaProject.websocket.WebSocketException;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
@@ -45,6 +46,10 @@ public ReservationResponse proceed(ReservationProceedRequest reservationProceedR
     @Transactional
     public ReservationResponse save(ReservationRequest reservationRequest, String date, Map<String, Object> header) {
 
+        if (reservationRepository.existByDateAndTime(toLocalDate(date), reservationRequest.startTime(), reservationRequest.endTime())) {
+            throw new WebSocketException("해당 시간에 예약내역이 존재합니다.");
+        }
+
         String email = getValueFromHeader(header, "email");
         User user = userService.getUserByEmail(email);